Mechanical movement.



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No. 645,083. Patented Mar. I3, |900. C. R. GABRIEL.

MECHANICAL MOVEMENT.

(Application led Feb. 23. 1899.)

(No Modal.) 3 Sheets-*Sheet 2.

il @will No. 645,083. Patented Mar. ls, |900. V

lc. R. GABRIEL.

MECHANICAL MOVEMENT.

(Application med Feb. 23, 1s99.\ (No Model.) 3 Sheets-Sheet 3.

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' OIIARLES R. GABRIEL, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO TIIBROWN d; SIIARPE MANUFACTURING COMPANY, OF SAME PLACE;

MECHANICAL wioveivi Eintr.

SPECIFICATION forming part of Letters Patent N o. 645,083, dated March1319O. Application filed February 23, 1899. Serial No. 706,445. (Nomodel.)

To @ZZ whoml t may concer/t: of the cam-toothmay be varied to give theBe it known that I, CHARLES R. GABRIEL, desired starting and stoppingmotions and of the city and county of Providence, in the to Vary withincertain limits the time during State of Rhode Island, have inventedacertain which the driven gear is stationary when the 5 5 new and usefulMechanical Movement; and driving-gear constantly rotates. The gearsIdoherebydeclare thefollowingspecitication, may also be so proportionedthat the drivtaken in connection with the accompanying inggear will makeany desired number of drawings, forming a part of the same, to be arevolutionsin driving thedriven gear through full, clear, and exactdescription thereof. a single revolution, or more than one cam- 6o IoThe invention relates to rotary gearing, and tooth may be connected withthe driven gear, more especially to mechanism whereby a roso that itwill be brought to rest before it has tary gear may be driven for a partof a revomade a complete revolution. The mechanlution at a constantspeed andV be gradually ism above referred to may also be combinedstarted and stopped without jar or shock. with other gearing, so that adriven shaft 15 The invention may be embodied in various may be startedand stopped Without shock or mechanisms and may be used in various rejarand the number of revolutions made by lations where it is desired `togradually start the driven shaft before it is brought to rest. and stopamechanism and to drive it at a convaried as desired. stant speed duringthe interval between the In the accompanying drawings, Figures 1 7c zostarting and stopping or where it is desired and 2 show a side and endelevation, respecto bring a mechanism to rest for an instant tively, ofgearing embodying the primary'fea= at predetermined intervals. tures ofthe present invention inthe preferred Inits simplest form the inventioncomprises form. Fig. 3 is a plan View of a mechanism, a driven gear, agear for driving said driven showing all the features of the presentinz5 gear, and abutments moving in unison with vention in the preferredform. Fig. 4 is a said driving-gear, arranged diametrically opsideelevation ofthe same. Fig. 5 is an end posite'each other, and engagingthe opposite elevation, partly in section; and Figs. 6, 7, 8, sides of acam tooth connected with .said 9, and l0 are details of parts to bedescribed. driven gear. vVith this construction one of Referring toFigs. l and 2, l represents a 8o 3o the abutments acts against the oneflank of driven shaft which may be connected with the cam-tooth tostartthe driven gear from a any mechanism which it is desired tooperstate of rest and to gradually increase its ate by the gearing tobedescribed. A gear speed until said gear has the linear velocity 2 issecured to said shaft and is arranged to of the driving-gear, when saidgear is brought be engaged and driven by a gear 3, secured 35 intoaction and drives the driven gear until to ashaft 4. Acam-tooth isconnected with the other ankof the cam-tooth engages the the gear 2 inany suitable manner and, as other abutment, when said abutment acts toshown, is so connected by a ange 6, which gradually bring the drivengear to a state of extends from the side of the gear. The camrest, atwhich time the cam-tooth lies betooth 5 is provided with flanks 7 and 8and 9o 4o tween the abutments. Thus the driven gear with faces 9 and l0and is arranged to pass is always under positive control either ofthebetween two abutments, which are preferdriving-gear or of the abutmentsand camablyin the form of pins 1l and l2, as shown. tooth and is startedand stopped without These pins are arranged diametrically opposhock orjar. The driving-gear may be consite each other, and their centers arein line 45 stantly driven, in which case the driven gear with thepitch-circle of the gear 3. These will be brought to rest for an instantat inabutments are rotated in unison with the tervals, or thedriving-gear maybe intermitgear 3 and are preferably secured eitherditently driven, in which case the driven gear rectly to the gear 3 orto a disk 13, secured will be started and stopped without shock or tosaid gear or the shaft 8. The teeth of the roo '5a jar and will be heldin position when at rest gear 2 are removed at 14 to form a blank lbythe abutments and cam-tooth. The shape space. Vhenthe parts are in theposition shown in Figs 1 and 2, the gear 2 will be stationary and willbe held by the action of the pins 11 and 12 on the tooth 5. Supposingthe gear 3 to revolve in the direction ofthe arrow, the pin 11 will actagainst the flank 7, starting the gear 6 from a state of rest andgraduallyincreasing the speed of said gear as the pin passes through aquadrant of a circle until when the pin reaches the line of centers ofthe gears 2 and 3 gear 3 is moving at the same linear speed as gear 2.This movement of the gear 2 brings the tooth 15 into position to beengaged by the tooth 16 of the gear 3, and said gear 3 continues todrive the gear 2 until said gear 2 has made nearly a com pleterevolution, when the flank 3 engages the pin 12, and at the same timethe tooth 17 of gear 3 leaves the space 18 of gear 2. Now as the gear 3revolves the pin 12 acts against the flank 8 to gradually retard thegear 2 until said gear is brought to a state of rest, when the partsarrive at the position shown in Figs. 1 and 2. Vhen the pin 11 is actingon the Hank 7, the pin 12 passes over face 10 and holds the piu v11 andflank 7 in engagement, and when pin 12 engages flank 8 pin 11 passesover face 9. Thus the gear 2 is started gradually and is engaged withthe gear 3 when moving at the same speed and after nearly completing arevolution isdisengaged from gear 3 and gradually brought to rest.

In the mechanism shown the sizes of the gears 2 and 3 and the number ofteeth in each are so related 'and the shape of the cam-tooth is soproportioned that the shaft 4 makes four revolutions in revolving theshaft 1 one revolution. 1t will be understood, however, that 'thisparticular ratio and construction is selected merely for the purpose ofillustration and that the parts may be proportioned so that thedriving-gear will make the same number of revolutions as the driven, orthe ratio between the revolutions of the two gears may be otherwisevaried. It will also be understood that, if desired, more than onecamtooth may be connected with gear 2, so that said gear will be broughtto rest before it has completed a revolution. If the driven gear isbrought to rest at each revolution of the driving-gear, it will beobvious that the teeth between tooth 16 and tooth 17 will not act on thegear 2 and said teeth may be removed instead of forming blank spaces 14on gear 2. The flanks 7 and S of the cam-tooth may be changed to varythe motion given to the gear 2 in starting and stopping, in which casethe faces 9 and 10 will be correspondingly changed. It is preferred,however, to make these lflanks parallel to lines drawn from the centerof the pins 11 and 12 through the center of gear 2, as with this form offlank the gear 2 will be started and stopped with aharmonic motion.

lnay be slightly curved, if desired, so that the gear 2 will be broughtto rest slightly before the gear 3 arrives in the position shown.

The upper ends of the flanks If desired, however, this curve may beomit-y ted, so that there will be no lost motion bctween pins 11 and 12and tooth 5, in which case the gear 2 will be stopped and started with apure harmonic motion and there will be no dead-time between the stoppingand starting of gear 2 when gear 3 is rotated continuously.

The shape of the abutments may be varied,

if desired; but it is preferred to make the engaging surfaces of saidabutments arcs of circles the centers of which are in the pitch-surfaceof the gear 3.

The shaft 4 may be driven either continuously or intermittently, andwhen driven intermittently should make as many revolutions before comingto rest as may be necessary to bring the cam-tooth between the rotaryabutments. Thus in the construction shown, in which one cam-tooth isused and the parts are so proportioned that the driving-shaft makes fourrevolutions to one of the driven, the shaft 4 shouldbe given fourrevolutions before it is brought to rest. In Figs. 3, 4, and 5 is showna preferred form of mechanism for driving the shaft 4 intermittently,which is as follows: A clutch member 19 is secured toaconstantly-running shaft 20, the end of which has a bearing in abushing 2l, which is mounted in the end of a sleeve 22, secured to theshaft 4. A clutch member 23 is keyed to slide on the slee ve 22 and ispressed toward the clutch member 19 by a spring 24, said clutch members19 and 23 forming an intermittently-operating driver for operating theshaft 4. The clutch member 23 is held out of engagement by a cam 25,carried by said member, which engages an abutment in the form of a pin26 on the end of an arm 27. The arm 27 is secured to a rock-shaft 28 andis held in position by a spring-pressed pin 29, which engages the end ofarm 27. XVhen the arm 27 is rocked, as it may be by any suit able means,the pin 26 is moved out of the path of the cam 25 and allows the clutchto be engaged. The shaft 4 is now revolved until the pin 26 is againbrought into the path of the cam 25, when said `cam acts to force theclutch member 23 back and disengage the clutch. The pin 26 may be heldout of the path of the cam 25 for the proper length of time by anysuitable means, and in the construction shown is so held by a disk 30,secured to shaft 1. This disk is arranged to engage the end of a pin 31,projecting from an arm 32, secured to the shaft 2S. The disk is providedwith a notch 33, in which the pin 31 normallystands. When the shaft 28is rocked and the shaft 1 begins to revolve, the disk passes under thepin 31 and prevents the return of the pin 26 into the path of cam 25until the shaft l has nearly completed a revolution. A disk 34 issecured to the shaft 4 and is provided with a V-shaped notch 34', whichis engaged by the V-shaped end of -a pin 35', carried by an arm 35,loosely mounted on shaft 28 and held in position by a spring- ICO IIO

pressed pin 36. A pin'37 projects laterally from the arm 35 and engagesthe under side of the arm 27. Vhen arm 27 is rocked to withdraw the pin26, arm 35 is also rocked to withdraw the pin carried thereby from thenotch in disk 34, and when the pin 26 is returned the pin carried by arm35 rides on disk 34 and engages the V-shaped notch, thus drawing theclutch-cam around sufficiently to prevent the clutch-teeth clickingafter the teeth disengage and preventing the cam 25 running by the pin26 and holding the shaft 4 in position until the pin 26 is againwithdrawn.

When the above mechanism is used to drive the shaft 4, it will be seenthat said shaft is started suddenly at full speed and as suddenlybrought to a stop when the clutch is thrown out. The gear 2, however,will be gradually started and stopped, although it will be driven atfull speed for the greater portion of its revolution. In order that theclutch in the above form of driving mechan- Aism may be disengagedproperly, it is desirable that there shall be little or no resistance tothe rotation of shaft 4 when said clutch is thrown out-that is to say,it is advantageous that the clutch should not be doing any work otherthan overcomin g the resistance of spring 24 while the cam 25iswithdrawing the clutch member 23. Itl is preferred, therefore, to soform the tooth 5 that the gear 2 will be brought to4 rest slightlybefore the abutments reach the position of Fig. 2, thus causing theshaft 4to have aslight idle movement after the gear 2 has come to rest.

It may in some cases be desirable to start and stop the shaft 1gradually and without shock or jar and to rotate said shaft at asubstantially-constant speed for more than one revolution between thestarting and stopping, and in Figs. 3, 4, and 5 is shown a mechanism foraccomplishing this vresult and also for varying the number ofrevolutions made by shaft 1 between the starting and stopping. As shownin these iigures, the gear 2 is loosely mounted on the shaft 1 and isconnected thereto by means to be described. A gear 33 is secured toshaft 4 and engages a gear 39, loosely mounted on shaft 1. The gear 2 isprovided with socket 40, formed between two lugs 4 1, projecting fromsaid gear, and gear 39 is provided with a similar socket 42,.formedbetween lugs 43. These sockets stand opposite each other when the pins11 and l2 are in the position shown in the drawings. An arm 44 issecured to the shaft 1 and is provided with a sliding bolt 45, adaptedto engage one or the other of sockets or 42 and connect gear 2 or 39 tothe shaft 1. The gear 3S is one-fourth the diameter of gear 39, and theshaft 1 will therefore be revolved one revolution for every fourrevolutions of shaft 4 whether gear 2 or gear 39 is connected therewith,the difference being that when gear 39 is connected with shaft l saidshaft is not brought to rest at every fourth revolution of of shaft 1,and then the bolt is shifted into the socket 42, thus connecting gear 39with said shaft and disconnecting gear 2, which runs idly thereon. Thegears 38 and 39 now drive shaft 1 continuously -until it is desired tostop said shaft, when the bolt 45 is shifted back into the socket 40 toconnect gear 2 with shaft 1 and disconnect gear 39. As part of therevolution of gear 3 is consumed in starting and stopping the gear 2,the gear 3 will drive gear 2 at a slightly-higher rate of speed thangear 39 is driven, and the sockets 40 and 42 will be opposite each otherat only two points in the revolution of gears 39 and 2- namely, when theparts are in the position shown and when the gears have made ahalfrevolution. Means are therefore provided for shifting the bolt 45from one gear to the other when the gears have made a half-revolutionfrom the positions shown. The bolt 45 is provided with two caxn -lugs 46and 47, constructed to engage an abutment in the form of a roll 43,mounted on a sliding shaft 49. The distance between the lugs 46 and 47is such that thelugs may pass on opposite sides of the roll 4S, andafter the bolt has been shifted by one of the lugs it will remain in itsposition until the roll 4S is shifted into the path of the other lug,when said lug will operate against said roll to shift the bolt. Theposition of the roll 4S may be controlled in any suitable manner, and inthev drawings is shown a form of mechanism for controlling said roll, sothat the shaft 1 may be brought to rest at each revolution, or after tworevolutions, or after four revolutions, or after eight revolutions. Thismechanism is as follows: The shaft 49 is mounted to slide in bearings 50and 51 and is held from rotation by an arm 52, secured thereto andvcarrying a pin 53, which slides in an arm 54 on bearing 50. A cam-drum55 is loosely mounted on shaft 49, between the arm 52 'and a collar 56,secured to the shaft. A gear 57 is secured to the cam-drum 55 and isconnected by gears 58, 59, and 59 with the shaft l, the gearing being soproportioned that shaft 49 makes one revolution for eight revolutions ofshaft 1. The drum 55 is provided with three camgrooves 63, 64, and andalso an annular groove 66, and a pin 60 is arranged to engage any one ofsaid grooves. The pin 60 is mounted in a stationary arm 61, providedwith four holes corresponding to the four grooves in the drum 55. Thearm 52 is provided with a stop 62, arranged to move back of the end ofarm 32 and prevent the pin 25 from returning into the path of cam 26. g

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i 64 oss If the shaft 1 is to be brought to rest after each revolution,then pin is arranged to engage the groove 66 and roll 48 remains in theposition shown. Supposing, however, that it is desired to bring theshaft 1 to rest only at the end of two revolutions, then the pin 60 isarranged to engage groove 63, as shown in Fig. 4, and in this case theaction is as follows: When the shaft 28 is tripped, the shaft4 isrevolved and the gear 2 started by the pins 11 and tooth 5, and theshaft 1 is driven for a half-revolution by the gears 2 and 3, as abovedescribed. While the shaft 1 is making a half-revolution the cam-drum 55is advanced and the cam 67, Fig. 7, acts on pin 60, thus moving shaft 49and roll 48 to the left, Fig. 4. This brings the roll 48 into the pathof lug 46 and brings stop 62 behind arm 32. The shaft 4 makes tworevolutions in turning gear 2 a half-revolution, and consequently gear38 during this time turns gear 39 a half-revolution, thus bringingsocket 42 into line with socket 40. As lug 46 passes roll 48 the inclineon said lug acts against said roll, and the bolt 45 is shifted fromsocket 40 to socket 42 and shaft 1 is driven by gear 39. As soon as thelug 46 has passed roll 48 the cam 68 acts on pin 60 and the shaft 49 isshifted, so that when the lugs 46 and 47 again pass said roll lug 47acts against said roll and shifts the bolt 45 into socket` 40 again. Thegear 2 now drives shaft l until the tooth engages pin 12, when the gear39 and shaft are gradually brought to rest. At this time the pin 3l hasentered into the notch in disk 30 and the shaft 4 is stopped, as beforedescribed. W'hen the shaft 1 has thus been brought to rest, the pin 60is at the point 69 in the cam-groove 63, the drum having been advancedone-fourth of a revolution. Thus the shaft 1 is given two revolutionsbefore it is brought to rest, the gear 2 driving said shaft for ahalf-revolution, then gear 39 driving said shaft for a revolution, andthen gear 2 driving said shaft for a half-revolution. The pin 31 isprevented from entering the recess in disk 30 at the end of the firstrevolution of shaft 1' by the stop 62, which has not at this time beenmoved from behind arm 32. The cam-groove 63 has four duplicate s ets ofcams 67 and 68 and points 69, and the drum 55 is advanced afourthrevolution each time the shaft 28 is rocked. The cam-groove 64 hasonly two sets of cams 67 and 68 and points 69, and if the pin 60 isarranged to engage this groove the roll 48 will not be moved back toengage lug 47 until shaft l has revolved three and a half-revolutions.The shaft l will therefore make four revolutions before being brought torest, being driven three revolutions by gear 39 and two half-revolutionsby gear 2. The camgroove has only one set of cams, and, with the pin 60in this groove, the shaft 1 will be driven eight revolutions beforebeing brought to rest. By varying the speed of cam-drum 55 and thearrangement of cams the shaft vmay be given any desired number ofrevolutions before being brought to rest. It will be understood that thecam-drum may be held from longitudinal movement and the pin 60 beconnected with the shaft 49 or the construction otherwise varied withoutdeparting from the invention.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The combination of a driven gear, of a driving-gear, a cam-toothconnected with said driven gear, and two diametrically-oppositeabutments rotating with said drivinggear and arranged to simultaneouslyengage opposite sides of said cam-tooth.

2. The combination of a driven gear, a driving-gear, a cam -toothconnected with said driven gear, and two abutments having cylindricalsimultaneously engaging surfaces for engaging opposite sides of saidcam-tooth, the centers of said engaging surfaces being arrangeddiametrically opposite each other and in the pitch-surface of saiddriving-gear.

3. The combination of an unmutilated driving-gear, a driven gear havinga blank space, means for starting said driven gear with agradually-increasing speed and engaging said gears when both are movin gat the same speed, and means for gradually bringing said driven gear toa state of rest when said gears are disengaged.

4. The combination of a driven gear, a camtooth connected therewithhaving flanks parallel to radial lines of said gear, a drivinggear, twoabutments rotating with said driving-gear, and having cylindricalengaging surfaces the centers of which are diametrically opposite eachother and in the pitch-surface of said driving-gear.

5. The combination of a gear 2 provided with blank space 14, a gear 3for engaging gear 2, a

cam-tooth 5 connected with gear 2 and extending beyond the center ofgear 3, and pins 11 and 12 connected with gear 3.

6. The combination of agear 2 provided with blank space 14, a gear 3 forengaging gear 2, a cam-tooth 5 havingflanks parallel to radial lines ofthe gear 2, and pins 11 and 12 having their centers in the pitch-surfaceof gear 3 and connected with said gear.

7. The combination of a driven gear provided with a blank space, adriving-gear which makes a plurality of revolutions for each revolutionof the driven gear, a cam-tooth connected with said driven gear,and twoabutments rot-ating with said driving-gear for engaging opposite sidesof said cam-tooth.

8. The combination of a driven gear provided with a blank space, adriving-gear, two diametrically opposite abutments having their centersin the pitch-surface of said driving-gear and rotating therewith, acam-tooth connected with said driven gear and arranged to lie betweensaid abutments when the blank space is opposite the driving-gear.

9. The combination of a driven gear, a drivmeans for starting saiddriven gear with an accelerated speed and engaging said gears when bothare at the same speed, and means for sto pping said driven gear at theend of a single revolution with a retarded speed when said gears aredisengaged.

lO. The combination of a driven gear, of a driving-gear which makes aplurality of revolutions for one revolution of the driven gear, twoabutments rotating with the driving-gear, said driven gear having twoengaging surfaces connected therewith for coacting with said abutmentsin gradually starting said driven gear and gradually stopping saiddriven gear at the end of each revolution.

11. The combination of a driven gear 2, a cam-tooth 5, connectedtherewith having flanks 7 and 8 rounded off at their outer ends, adriving-gear 3, pins 11 and 12 connected therewith and arranged toengage the flanks 7 and S..

12. The combination of a driven gear 2, a cam tooth 5 connectedtherewith having flanks 7 and 8 and faces 9 and 10, a drivinggear 3,pins 11 and 12 connected therewith and arranged to engage thesaid fianksand faces.

13. The combination of a driven gear 2, a cam tooth 5 connectedtherewith having fianks 7 and 8, rounded off at their outer ends, adriving-gear 3, pins 1l and 12 connected therewith and arranged toengage said flanks, a clutch for driving-gear 3, a cam on said clutch,an abutment for engaging said cam and disengaging said clutch, and meansfor tripping said abutment.

14. The combination of a driven gear, a cam-tooth connected therewith, adrivinggear, two abutments rotating with said driving-gear arranged tosimultaneously engage the opposite sides of said cam-tooth, and anintermitten'fly-operating driver for said driving-gear.

15. The combination of a driven gear, a cam-tooth connected therewith, adrivinggear, two abutments rotating with said driving-gear arranged toengage opposite sides of said cam-tooth and means for stopping therotation of said driving-gear after each revolution of said driven gear.

16. The combination of a driven gear, a cam-tooth connected therewith, adrivinggear, two abutments rotating with said driving-gear arranged toengage opposite sides of said cam-tooth, a driver for said driving-gear,means for intermittently throwing said driver into operation, and meansfor throwing said driver out of operation when the cam-'tooth liesbetween said abutments.

17. The combination of a driven gear, a cam-tooth connected therewith, adrivinggear, two abutments rotating with said driving-gear arranged toengage opposite sides of said cam-tooth, a constantly-running shaft, aclutch for coupling said driving-gear to said shaft, a cam on saidclutch, an abutment for engaging said cam and disengaging said clutch,and means for tripping said abutment.

1S. The combination of a constantly-running shaft, a second shaft,aclutch for coupling said shafts together, a cam on said clutch, anabutment for engaging said cam and disengaging said clutch, adriving-gear secured to said second shaft, two diametrically-oppositeabutments arranged in line with the pitchsurface of said gear andcarried by said second shaft, a driven gear engaged by said driving-gearhaving a blank space, a cam-tooth connected with said driven gear andarranged to be engaged by said abutments.

19. The combination of a driven gear, a cam-tooth connected therewith, adrivinggear, two diametrically-opposite abutments rotating with saiddriving-gear and arranged to engage opposite sides of said cam-tooth,the iianks of said cam-tooth being rounded off at theirouter ends, sothat said abutments may move through a short arc without moving saiddrivengear, a clutch for driving said driving-gear, a cam on saidclutch, an abutment for engaging said cam and disengaging said clutch,and means for tripping said abutment.

20. The combination with a shaft, of devices for starting said shaftwith an accelerated speed and stopping said shaft at the end of aplurality of revolutions with a retarded speed, and gearing for drivingsaid shaft at a substantially-constant speed between the starting andstoppin fr.

21. The combination with a shaft, of two gears loosely mounted thereon,a drivingshaft, a gear thereon meshing with one of said gears, devicesfor starting the other gear with an accelerated speed and stopping saidgear with a retarded speed, devices for coupling either of said gears tothe shaft and uncsoupling the other.

22. The combination with a shaft, of two gears loosely mounted thereon,a drivingshaft, a gear thereon meshing with. one of said loose gears, asecond gear thereon for engaging the second loose gear, a cam-toothconnected with said second gear, two abutments rotating with saiddriving-shaft and arranged to engage opposite sides of said cam-tooth,and means for coupling either of said loose gears to the driven shaftand uncoupling the other. y

23. The combination with a driven shaft, of two gears loosely mountedthereon, a drivingshaft, a gear thereon meshing with one of said loosegears, a second gear thereon for engaging the second loose gear, acam-tooth con- IIO nected with said second gear, two abutments yrotating with said drivin g-shaft and arranged to engage opposite sidesof said cam-tooth, a coupling-bolt connected with said driven shaft andarranged to engage either of said loose gears, and means for shiftingsaid bolt from one gear to the other when both are in motion. 24. Thecombination with a driven shaft, of

two gears loose thereon, means for driving one of said gears at aconstant speed, means forv starting the second gear with an acceleratedspeed and stopping said gear with a retarded speed, means for couplingone of said gears to said driven shaft and uncoupling the other whenboth are in motion.

25. The combination with a driven shaft, of

two gears thereon, means for driving one of said' gears at a constantspeed, means for starting the second gear with an accelerated speed andstopping said gear with a retarded speed, a bolt connected with saiddriven shaft and arranged to engage either of said gears, and means forshifting said boltfrom one gear to the other when both are in motion.

26. The combination with a driven shaft, of two gears loose thereon,means for driving one of said gears at a constant speed means forstarting the second gear with an accelerated speed and stopping saidgear with a retarded speed,a boltconnected with said driven shaft andarranged to engage either of said gears, cani-lugs on said bolt anda'laterallymovable abutment arranged diametrically opposite the startingand stopping point o said second gear.

27. The combination with a driven shaft, of two gears loose thereon,means for driving one of said gears at a constant speed, means forstarting the second gear with an accelerated speed and stopping saidgear with a ref tarded speed,a bolt connected with said driven gears,cam-lugs on said bolt, a laterally-movable abutment arrangeddiametrically opposite the starting and stopping point of said secondgear, and a series of cams for controlling the position of saidabutment.

29. The combination with a driven shaft, of two gears loose thereon, adriving-shaft, a gear thereon` meshing with one of .said loose gears, asecond gear on said driving-shaft for engaging the second loose gear, acam-tooth connected with said second loose gear, two abutments rotatingwith said driving-shaft and arranged to engage opposite sides of saidcam-tooth, a bolt connected with said driving-shaft, and means forshifting said bolt from engagement with one of said loose gears intoengagement with the other loose gear While both are in motion.

30. TheV combination with a driven shaft, of two gears 2 and'f) loosethereon, means for driving gear 39 at a constant speed, means forstarting gear 2 with an accelerated speed and stopping said gear witha'retarded speed, a bolt 45 for connecting either of said gears to saidshaft, an abutmentllS for operating said bolt, a cam-drum for operatingsaid abutment provided with a series of varying camgrooves, and a pinfor rendering any of said cam-grooves operative.

3l. The combination with a driven shaft l, of two gears 2 and 39 loosethereon, a drivingshaft 4, carrying the gears 3 and 38, a camtooth 5connected with gear 2, abutments 1l and l2 carried by shaft, aconstantly-driven shaft 20, a clutch for connecting shafts 4 and 20, acam on said clutch, a movable abutment for engaging said cam and holdingthe clutch out of action, means for coupling either gear 2 or 39 to theshaft l, and uncoupling the other, and means for holding the movableabutment out of the path of the said cam while gear 39 is coupled tosaid shaft.

i CHARLES R. GABRIEL.

Witnesses:

F. A. GALLAGHER, Jr., IRA L. FIsH.

